HOW A PREGNANCY STARTS
A pregnancy starts with sex between a man and a woman. When a couple are having sex, after some time, when the man is sexually aroused and hopefully the woman is too, he puts his penis into her vagina and as he moves backwards and forwards, her vagina becomes more engorged and sensitive. Those feelings build up and up until he, or they, experience orgasm, during which the muscles around the genital area contract strongly again and again and a sensation of intense pleasure and then relaxation follows.
Basically, when the man is aroused his penis becomes hard. During sexual activity, he puts his erect penis into the woman’s vagina. With further stimulation, he has an orgasm and ejaculates, which means that semen, containing sperm, spurts out from his penis.
When the man ejaculates inside the vagina, tens of millions of sperm rush up through the woman’s cervix into the uterus. Many find their way into her Fallopian tubes. Most get lost and die on the way, but if there is a newly-released egg in one of the Fallopian tubes, the first sperm to reach the egg and burrow through its protective coating will start a new pregnancy. This is called fertilization and when a sperm fertilizes an egg, we call that conception. Once the egg is fertilized, no other sperm can penetrate it, and it travels down the Fallopian tube and implants in the lining of the uterus, where it starts to grow.
In the following sessions you will learn all about the different ways to prevent conception. This is called contraception.
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